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Subject[PATCH v7 03/11] clk: actions: Add common clock driver support
Date
Add support for Actions Semi common clock driver with generic structures
and interface functions.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/clk/Kconfig | 1 +
drivers/clk/Makefile | 1 +
drivers/clk/actions/Kconfig | 4 ++
drivers/clk/actions/Makefile | 3 ++
drivers/clk/actions/owl-common.c | 89 ++++++++++++++++++++++++++++++++++++++++
drivers/clk/actions/owl-common.h | 41 ++++++++++++++++++
6 files changed, 139 insertions(+)
create mode 100644 drivers/clk/actions/Kconfig
create mode 100644 drivers/clk/actions/Makefile
create mode 100644 drivers/clk/actions/owl-common.c
create mode 100644 drivers/clk/actions/owl-common.h

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 98ce9fc6e6c0..6313a4f4327a 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -238,6 +238,7 @@ config COMMON_CLK_VC5
This driver supports the IDT VersaClock 5 and VersaClock 6
programmable clock generators.

+source "drivers/clk/actions/Kconfig"
source "drivers/clk/bcm/Kconfig"
source "drivers/clk/hisilicon/Kconfig"
source "drivers/clk/imgtec/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 71ec41e6364f..b7909df532ed 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o

# please keep this section sorted lexicographically by directory path name
+obj-y += actions/
obj-$(CONFIG_COMMON_CLK_AT91) += at91/
obj-$(CONFIG_ARCH_ARTPEC) += axis/
obj-$(CONFIG_ARC_PLAT_AXS10X) += axs10x/
diff --git a/drivers/clk/actions/Kconfig b/drivers/clk/actions/Kconfig
new file mode 100644
index 000000000000..13a3e5083d43
--- /dev/null
+++ b/drivers/clk/actions/Kconfig
@@ -0,0 +1,4 @@
+config CLK_ACTIONS
+ bool "Clock driver for Actions Semi SoCs"
+ depends on ARCH_ACTIONS || COMPILE_TEST
+ default ARCH_ACTIONS
diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile
new file mode 100644
index 000000000000..64a50fc2d335
--- /dev/null
+++ b/drivers/clk/actions/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_CLK_ACTIONS) += clk-owl.o
+
+clk-owl-y += owl-common.o
diff --git a/drivers/clk/actions/owl-common.c b/drivers/clk/actions/owl-common.c
new file mode 100644
index 000000000000..61c1071b5180
--- /dev/null
+++ b/drivers/clk/actions/owl-common.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL common clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "owl-common.h"
+
+static const struct regmap_config owl_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x00cc,
+ .fast_io = true,
+};
+
+static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
+ struct regmap *regmap)
+{
+ int i;
+ struct owl_clk_common *clks;
+
+ for (i = 0; i < desc->num_clks; i++) {
+ clks = desc->clks[i];
+ if (!clks)
+ continue;
+
+ clks->regmap = regmap;
+ }
+}
+
+int owl_clk_regmap_init(struct platform_device *pdev,
+ const struct owl_clk_desc *desc)
+{
+ void __iomem *base;
+ struct regmap *regmap;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
+ if (IS_ERR(regmap)) {
+ pr_err("failed to init regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ owl_clk_set_regmap(desc, regmap);
+
+ return 0;
+}
+
+int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
+{
+ int i, ret;
+ struct clk_hw *hw;
+
+ for (i = 0; i < hw_clks->num; i++) {
+
+ hw = hw_clks->hws[i];
+
+ if (IS_ERR_OR_NULL(hw))
+ continue;
+
+ ret = devm_clk_hw_register(dev, hw);
+ if (ret) {
+ dev_err(dev, "Couldn't register clock %d - %s\n",
+ i, hw->init->name);
+ return ret;
+ }
+ }
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
+ if (ret)
+ dev_err(dev, "Failed to add clock provider\n");
+
+ return ret;
+}
diff --git a/drivers/clk/actions/owl-common.h b/drivers/clk/actions/owl-common.h
new file mode 100644
index 000000000000..4fd726ec54a6
--- /dev/null
+++ b/drivers/clk/actions/owl-common.h
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL common clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#ifndef _OWL_COMMON_H_
+#define _OWL_COMMON_H_
+
+#include <linux/clk-provider.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+
+struct device_node;
+
+struct owl_clk_common {
+ struct regmap *regmap;
+ struct clk_hw hw;
+};
+
+struct owl_clk_desc {
+ struct owl_clk_common **clks;
+ unsigned long num_clks;
+ struct clk_hw_onecell_data *hw_clks;
+};
+
+static inline struct owl_clk_common *
+ hw_to_owl_clk_common(const struct clk_hw *hw)
+{
+ return container_of(hw, struct owl_clk_common, hw);
+}
+
+int owl_clk_regmap_init(struct platform_device *pdev,
+ const struct owl_clk_desc *desc);
+int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks);
+
+#endif /* _OWL_COMMON_H_ */
--
2.14.1
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